As decided a while back, this isn't a transition we want to chance.
Whenever someone wants to got to RESET, force it.
---
Still depends on the JTAG adapter to get it right though, which
many don't. (FT2232 does now.)
src/jtag/core.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
--- a/src/jtag/core.c
+++ b/src/jtag/core.c
@@ -567,12 +567,14 @@ int jtag_add_statemove(tap_state_t goal_
tap_state_name(goal_state));
- if (goal_state == cur_state)
- ; /* nothing to do */
- else if (goal_state == TAP_RESET)
- {
+ /* If goal is RESET, be paranoid and force that that transition
+ * (e.g. five TCK cycles, TMS high). Else trust "cur_state".
+ */
+ if (goal_state == TAP_RESET)
jtag_add_tlr();
- }
+ else if (goal_state == cur_state)
+ /* nothing to do */ ;
+
else if (tap_is_state_stable(cur_state) &&
tap_is_state_stable(goal_state))
{
unsigned tms_bits = tap_get_tms_path(cur_state, goal_state);
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